Would you rather live with the knowledge that humans will live for thousands more years and flourish, and you live in the worst period of civilisation, or that all life is inherently limited and we are inevitably approaching global disaster, with you living in the absolute golden age of humanity?

Either you live your life knowing that humankind will survive for thousands on thousands of years, our civilisations will expand beyond the solar system, life as we know it will continue to improve after your lifetime and that we are arguably still living in the worst period to be alive as a human -or- our decline is natural and inevitable, and you currently live in the apex period of the world.
In both cases, your quality of life continues to increase with advances in medicine and technology until you die. For the second option, the decline of man begins after your death, either following the current predictions of environmental scientists, occurring as a result of a thermonuclear world war, or coming about as the result of a major natural disaster.


Source.